/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package net.hasor.search.server.servlet;
import java.io.IOException;
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
 * A Simple redirection servlet to help us deprecate old UI elements
 */
public class RedirectServlet extends BaseSolrServlet {
    static final String CONTEXT_KEY = "${context}";
    String              destination;
    int                 code        = HttpServletResponse.SC_MOVED_PERMANENTLY;
    @Override
    public void init(ServletConfig config) throws ServletException {
        super.init(config);
        destination = config.getInitParameter("destination");
        if (destination == null) {
            throw new ServletException("RedirectServlet missing destination configuration");
        }
        if ("false".equals(config.getInitParameter("permanent"))) {
            code = HttpServletResponse.SC_MOVED_TEMPORARILY;
        }
        // Replace the context key
        if (destination.startsWith(CONTEXT_KEY)) {
            destination = config.getServletContext().getContextPath() + destination.substring(CONTEXT_KEY.length());
        }
    }
    @Override
    public void doGet(HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException {
        res.setStatus(code);
        res.setHeader("Location", destination);
    }
}